可以想象，如果句法操作没有任何代价，几个候选项的句式推倒具有相同的经济性（economy of derivation），那 ［22］么所有生成语法理论都会允许一定程度的多选性。
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Elasticity, also called relative derivation, is extensively applied in the activity of commodity economy , such as adjusting the demand with price.
弹性又称为相对导数，它在商品经济活动中有着广泛的应用，诸如用价格调节需求等。
This treatment is believed to better satisfy the Principle of Economy for syntactic representation and derivation.
我们的观点更好地体现了句法推导和表达的经济原则。
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